Improvement in padlocks



n. AK, MILLER.

4. 8 L .2 a 6 D. d VC f.. n C a P nu ou S k Pu o L n d a P .8, 5 0 N THE GRAPHIC C0. PMQTO 'LITILSQ lx' 4*! VARI(v PLACE, N Y.

UNITED S'rA'rEs A'rEN'r OEEroE.-

DANIEL K. MILLER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN PADLOCKS, fcc.

Specification forming part of Letters Patent No. 158,] l l, dated December 22, 1874; application filed April 6, 1874.

To all whom it may concern:

Be it known that l, DANIEL K. MILLER, of the city and county of Philadelphia, State of Pennsylvania, have invented Improvements in Locks, of which the following is a specification:

The object of my invention is a cheap, strong, and durable lock, admitting of being readily takenV apart and put together, and which cannot be easily picked.

The main feature of the lock is illustrated in the perspective views, Figures l and 2, and sectional view, Fig. 3, of the accompanying drawing; and consists in attaching the tumblers h and dogs c' of the lock to, and causing them to move with, the bolt or hasp A.

The casing B of the lock is, by preference, of the rectangular shape shown, with round corners, and has an internal partition, d, between which, and the opposite edge and sides of the case, the sliding bolt or hasp A can slide freely. The said bolt or hasp has a hooked end, e, which, when closed, is adapted to a recess, f, in the case, as shown in Fig. 3, the bolt and slotted end of the case together then forming a continuous eye, g, for the reception and retention of a staple, the latter being released when the bolt is shot outwardto the position shown in the sectional view, Fig. 4. The internal recess or recesses a cast in the lower end of the bolt are arranged for the reception of two pivoted dogs, t, and two sets of sliding tumblers, h, which are acted on by springs j, which tend to depress them, there being in the present instance five tumblers in each set, as shown in the transverse section, Fig. 5. When the bolt is drawn in and the tumblers depressed, as shown in Fig. 3, the dogs i are forced outward by the said tumblers against inclined shoulders 7c of the case, thus efectually preventing the outward movement of the bolt 5 but when the whole of the tumblers of both sets are pushed upward by a key of proper character, inserted through the hole on in the said case to such an extent as to bring all of the notches#n of the said tumblers in line and opposite the ends of the dogs, the continued upward pressure of the key will, owing to the inclination of the shoulders 7c, cause the said dogs to move inward and enter the notches in the tumblers, thus releasing the bolt, which may be forced outward by the key to the position seen in Fig. 4. When the bolt has reached this latter position the dogs strike other inclined shoulders, 7c', of the case, which thus determine the extent of the outward movement of the bolt and prevent its accidental withdrawal from the case; but if it should be necessary to entirely withdraw the said bolt, the dogs, which still remain in the notches of the tumblers, may,

by a slight effort in pushing in the key, be forced upward and past the inclined shoulders 7c', when there will no further obstacle to the removal of the said bolt. As the bolt, when thus forced out of the case, carries the tumblers and dogs with it, access can be readily obtained to any of said parts for purposes of repairs, or for changing the relative arrangement of the tumblers if unauthorized persons have obtained possession of the key.

As the bolt depends for its outward movement solely upon the pressure of the key the lock is much more difficult to pick than it would be if the bolt moved automatically forward as soon as the dogs and tumblers assumed the proper positions.

The usual necessity of providing the case BV with a detachable cap, and of having (except the key hole) any opening other or larger than that in which the bolt is introduced, is avoided, as the whole of the working parts are contained within the body of the bolt, and with the bolt can be introduced and withdrawn through the opening b in the case, which is cast in one piece.

When the bolt is pressed inward to the position shown in Fig. 3, the springs j of the tumblers force the latter downward and eject the ends of the dogs i from the inclined notches F the instant said dogs arrive at a point opposite the shoulders k of the case.

By casting the bolt with an internal recess or recesses, c, for the reception of the turn- Q ESqilll 1. A lock in which sliding notched tumblers h and vibrating dogs t', adapted to notches in said tumblers, are attached to and move With the bolt or hasp, substantially as and for the purpose set forth.

an additional movement of the latter is required to effect the adjustment of the dogs and the projection of the bolt.

In testimonyr whereof I have signed my name to this specification in the presence of tWo sub- D. K. MILLER. Witnesses:

WM. A. STEEL, J SHEEBOENE SINGER. 

